The invention relates to a specimen analyzer, which can analyze the mixed specimen with specimen and agent. It comprises: a container, a specimen supplier, the first specimen supplier, the second specimen supplier, the first detecting part, the first mixture specimen supplier, the second detecting part, and the second mixture specimen supplier. Wherein, the container is used to contain the mixture specimen and the specimen; the specimen supplier supplies the specimen to said container; the first specimen supplier supplies the first specimen to the container; the second specimen supplier supplies the second specimen to the container; the first detecting part detects the first mixture specimen of specimen and the first specimen; the first mixture specimen supplier supplies the first mixture specimen from the container to the first detecting pat; the second detecting part detects the second mixture specimen of first specimen and second specimen; the second mixture specimen supplier supplies the second mixture specimen from the container to the second detecting part; the first mixture specimen supplier keeps some first mixture specimen in the container and supplies some to the first detecting part; and the second specimen supplier supplies some second specimen to the container that contains left first mixture specimen to prepare the second mixture specimen.